If there is the slightest chance that being with him, could blow your recovery progress apart, say thanks for the apology but I can't make f to f contact right now.
This the man who treated you and his baby girl badly, heaped his anger and bitterness all on to you, and after 4 months silence, suddenly feels remorseful.
Whether it is because he is in a recovery program, has amends to make, or just needs to suck you back in to the unhappiness you left, you don't know.
Frankly my dear, if it were me I would be finding out more before I had personal contact with him, and making sure I was as strong in myself and my boundaries, as I could be.